Vintage Engelhard 1/4 oz. 9999 Fine Gold Bar In Sealed Assay Certificate #205689. Precious Metal Content per Unit. Total Precious Metal Content. The bar comes sealed in its original Assay Certificate and bears the serial #205689. If you have questions about this item please send us a message. In the event of a listing error (such as a duplication) we reserve the right to cancel the order. We are only responsible for a GSP item until it is delivered to the U. We guarantee all items to be genuine. Find More Like This.